Nice what kind of lighting are you using? I was thinking about the flood and drain but im a little confused about medium, what kind of pots, and the whole setup. My main concern is about the roots getting too dry. I agree changing the res is a bit of a hassle but i plan on having extra tubs so that i could prepare the solution before hand and then just throw in the lid, pump and manifold. I hope to connect all 6 pumps to a surge protector and find a timer that wont blow out